Desmidsfrom Massachusetts, U.S.A. By Wm. West. 21 



form figured by WoUe ; the front view showed the spines 



almost evenly distributed. 

 S. Brehissonii Arch. 

 8. echinatum Breb. 

 S. hirsutum Breb. 

 8. furcigerum Breb. 

 8. eustephanum Kalfs. I have given an end view and a front 



view of this from different specimens as it is such a variable 



species. Fig. 18. 

 ;S'. spongiosum Breb. This was frequent and variable, so I 



have given figures from eight different examples that were 



seen. Fig. 21. The measurements are in microns. 



This list includes 84 species and 5 varieties and forms. 



